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circumterrestrial |
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| The first space-based geodetic and cartographical systems were designed and placed into circumterrestrial orbit, which provided high-accuracy data about the figure of the Earth and the highly detailed satellite still photographs of its surface. Many countries, such as the Russian Federation and the United States, use nuclear power sources to produce electricity on board interplanetary and circumterrestrial satellites, which need high energy for a long time; just using solar energy is not sufficient. The Salyut and Mir orbital stations were part of a unique program for a stage-by-stage building of human presence in circumterrestrial space. |
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